Eugen is a user on You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.
Eugen @Gargron

You can also get Mastodon stickers from DesignByHumans:

Or print them yourself from the files available in the press kit on 😋

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@Gargron Idea: Stickers with a blank space for writing in an instance domain name.